Pulley



` pulley to Patented Aug. 16, 1927.

UNITED STAT Es WILLIAM '11. HENSLEY, or INDYIANAPOJ'IsiNDIANA;

IPULLEY This invention relates to the manufacture of pulleys, and more particularly to those constructed from laminaeof suitable material, suchas strawboard and the like', so that the edges of the laminae of iibrous material are presented at the surface of the form a frictional surface. Y

Itis an obj ect ofthe invention to provide a laminated pulley, preferably of theI paper type, in which the laminated material is more dense at the. inner portion than upon the outer'surfa'ce, thus providing a relatively soft and maximum friction'al surf-ace for enlgagement with a belt, and a relatively dense inner. portion. having a maximum mechanical strength.

Anotherobject ofthe invention is to lprovide a lan'iinatedy pulley composed-of parts which can be lcheaply manufactured and which 'can be quickly and easily assembled to form the pulley. ,n

A further object of the invention is to provide av laminated pulley in which the laminac'forming the body ofthe pulley are assembled upon and securely fastened to a Vith the above and other objects in viewA i the invention may be said to comprise the closed a laminate-d pull laminated pulley as illustrated in the accompanying drawings, hereinafter described and particularly set forth in the append-ed claims together with such variations and modifica-- tions thereof as will be apparent to thosev skilled in the art to which. the invention appertains. 1

Reference should be had to they accompanying drawings forming a' part of this specification in which,

Figure 1 is a sectional view takenl on an axial plane through a pulley embodying the invention.

Fig: 2 is an end Fig. 3 is a cross ofFig. 1.

Figs. 4, 5 and 6 are sectional views, each taken on an axial plane and each showing a different modification of the invention.

' Iny 'anv earlier application Serial No.

610,175', filed, January 2, 1923', Ihave disey in which the center portion ofthe pulley is formed of alternate laminae of metal and fibrous material compressed toV such bored tp' the' size of the shaft' tok which the pulleyV ...s liebe applied. vThe present inien eleva-tion ofthe pulley. section taken on line 3"-3 is composed Amaterial such as strawboard, paper, or other 'suitable material, the laminated body of `the pulley being density that it may be" Application filed August 1, 1924. Serial-No. 729,437.

tion provides a laminated pulley which is very economical: to manufacture when large 'numbers of pulleys are to be made of a given size ofi central bore and does away with the necessity` of the metal laminae though of 'course' they may be used if desired.

Referring tov thel accompanying drawings, Figs. 1 to 3 'show a pulley in which the body entirely of laminae of fibrous rigidly secured upon a tubular flangedr hub formed of a pair of stampings, each consisting of a tubular body portion 2 'and av flange yportion 3. The laminas l are inf the form .of plates of an internal dimension such that they may be slipped over and fit snugly upon the tubular body portions'Q of the hub members. The tubular portions of the hub members are received bythe axial openings of the plates, andmay abut or overlap at their inner ends as desired. Asshown in Fig. l, the inner ends of the tubular portions of the hub members are beveled at l to provide an interfitting engagement which serves to hold the sections of the hub in alinement. The -hub members'and the laminated body are secured together by means of rivet bars 5 extending between the flanges 3 and through the laminas l preferably near the tubular body ofthe hub, The bars 5 are preferably flat bars disposed with their side faces at right angles to a radial plane and are shouldered adjacent their ends to engage the inner faces of the end flanges 3 and have reduced ends projecting,V through the flanges'and headed over to rigidlyv secure the members in place. The end flanges 3 are preferably depressed,

as at 3, to form recesses in both Aends of the 'pulley so that the heads of the'rivets will not vis' soin'etimes preferable to provide additional laminas 1', shown in Fig. la wlii'li laminas are annular and fill in between the laminas periphery of the pulley to provide a rigid retainer and protector for the laminae.

It is desirable that the laminated body be rigidly keyed to the shaft and to this end the tubular portions 2 of the hub members 'ff are provided with longitudinal slots 7 to which extend the inner ends of set screws 8 which are inserted from the periphery of the pulley through radial bores 9 extending from the periphery and are screwed into threaded openings in oneof the rivet bars 5. The slots 7 serve as a leyway to receive the key on the shaft in which the pulley is mounted.

Figure 4 shows a modified form of the invention in which the tubular portion of the hub is integral from end to end. In this modification the laminae 11 are mounted upon a tube 12 which has short outturned flanges 13 at its ends, which engage and retain the end plates 14. The end plates 14 are annular in form and have their inner portions offset inwardly and lying within the outturned flanges 13 of the tube 12. The tube 12 may be flanged at one end only prior to the assembly of the pulley and the laminae may be positioned thereon and compressed. The second flange 13 may be formed by spinning or by a suitable application of pressure.

Rivet bars 15 extend through the end plates 14 and flanges 13 and through the laminae, said bars preferably having shoulders engaging the inner faces of the end plates 14 and reduced ends passing through the plates 14 and flanges 13 and headed over on the outer faces of the flanges 13. The end plates 14 have substantially the same form as the end flanges 3 in the modification first de scribed so that the heads of the rivet bars and the flanges 13 are in a central `depression at the ends of the pulley and flat end faces are provided by the outer portions of the plates- 14. Additional laminas 11a are provided to fill the space between the outer portions ofthe plates 14 and the main laminae 11. The plates 14 extend to adjacent the periphery of the pulley and are preferably beveled at their periphery to avoid an abrupt shoulder at the end of the pulley.

The tube 12 is provided with a slot 17 extending from end to end therein which serves as a lreyway to receive a key carried by the shaft on which the pulley is to be mounted. The set screws 18 are located in radial bores in the body of the pulley and preferably adapted to be used for pulleys of various lengths of face. In this modification the flanges 23 of the hub members are of O'reater b C diameter than the pulley so that they project beyond the periphery of thev laminated body portion and thus form guards for retaining a belt. Y

Figure 6 of'- the drawing shows a modifi-v cation in which the fillers at the ends of the pulley are eliminated, all of the laininae 31 extending from the tubular portion of the' hub to the periphery of the pulley. The hub comprises a pair of stampings having tubular portions 32, at the outer ends of which are the flaring outwardly'extending flanges 33 forming the end plates'integral with the hub, the laminated body being secured upon the tubular portions 32 and between the end flanges 33. rIhe hub members and laminated body are secured together by means ofvrivet bars 35, suitable set screws 38 being provided as previously described. The end flanges 33 have inner portions 33L which extend outwardly a` short distance at right angles to the axis to receive the ends of the rivet bars, and outer portions 33b which are shown as inclining outwardly to provide flaring ends.

In this form there is no need for filler plates and the inner portionof the pulley is compressed, forming a relatively dense inner portion having a maximum mechanical strength for engagement with a shaft and an outer portion providing a relatively soft frictional surface for engagement with a belt. It will be noted that in this form the end plates are easily formed and the assembly is easily compressed to form a pulley having the above desirable characteristics.

While the pulleys shown in the drawings are'indicated as having crown surfaces, that is of slightly greater diameter in the central portion than adjacent the end, it is perfectly obvious that the outer surface of the fibrous laminae may be trimmed infinishing the pulley to be cylindrical or any other desired contour. Y

It will be seen that the end plates of any of the pulleys shown in this application may either have a flaring outer portion, such as shown in Fig. 6, or may have the outer portion of the end plate bent back upon itself so that it is substantially parallel with the inner portions of the end plate which are at right angles to the Vaxis of the pulley and between which the laminas are compressed.

In any of these forms the portions of the end plates between which the llaminas are pressed may be termed inwardly, offset portions and when the end plates are forced together by pressure it obviously follows that the inner portions of the laminas will be compressed more than the outer portions and, therefore, become relatively dense.-

Furthermore, it is to be understood that the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for purposes of explanation and illustration and that various modifications of said apparatus and procedure can be made without departing from my invention as defined in the appended claims.

Wlhat I claim is:

l. A pulley for power transmission comprising fibrous laminas of compressible material, a pair of sheet metal tubular hubl members each carrying an end plate, said end plates each having inwardly extending. portions of less diameter than the .brous laminas, and shouldered rivets for holding said end plates against relative movement in each direction axially of the pulley, whereby said fibrous laminae when compressed will have a relatively dense inner portion and a relatively soft, frictional outer portion.

2. A pulley for power transmission comprising a tubular hub of sheet metal carrying end flanges, fibrous laminae mounted upon said hub, said end flanges having inwardly extending portions of less diameter than the fibrous laminae, said fibrous laminae being substantially compressed between said inwardly extending portions of the end flanges7 and means connecting said end flanges for holding them against relative longitudinal movement.

3. A pulley having a hub formed of two members each having a tubular portion provided with a longitudinal slot in its wall, and an outer flanged end, a body formed of laminee of fibrous material surrounding said tubular portion of the hub members and arranged side by side, a rivet for extending through the laminas and secured to the end flanges of the hub, and set screws carried by the rivet bar and engaging in the slots of the sections.

4. A pulley having a hub formed with 'a tubular portion provided with a longitudinal keyway and end flanges, a body formed of laminae of fibrous material arranged side by side, a rivet bar'connecting the end flanges and extending through the laminae, and set screws carried by the bar to engage said keyway.

5. A pulley for power transmission comprising fibrous laminas of compressible material, a tubular hub carrying end plates having inwardly extending portions of less diameter than the fibrous laminae, whereby movement of the end plates toward each other to compress the fibrous laminas will cause. the latter to have al relatively dense inner portion and a relatively soft, frictional, outer portion, and means extending through the fibrous laminae for holding the end plates against relative movement axially of the pulley.

6. A pulley for power transmission comprising a hub formed 0f two pressed sheet metal members each having a tubular hub portion and an annular flanged disc member formed on one end of the tubular portion and arranged at an angle thereto, a body portion formed of fibrous laminas arranged side by side and surrounding the tubular portions of said hub, said annular disc members each having a portion of considerably less radial dimension than said laminas extending outwardly substantially at right angles to said tubular portion, and a portion extending outwardly radially and longitudinally of said body, and means for rigidly securing said flanged disc members together against relative movement com.

prising a plurality of rivet bars completely embedded in the laminas of the pull-ey and each having a shouldered head portion adapted to space the hub members and to rigidly connect these members against lat- '.2

eral and circumferential movement in each direction. a

In testimony whereof, I hereunto aiiix my signature.

VILLIAM T. HENSLEY. 

